I dont know if this has anything to do with it, but when playing recently i started "bleeding FPS" first it wasnt noticeable but after a while it started droping 1 frame per minute down untill 6-3 fps, I assume this was caused by shit stacking up on the memory.
Also another of my encounters with the "3 FPS Bug" was so severe I got it within 20-40 mins of play everyday. Didnt know what it was but I went into "windows key + pause/brake" and saw it only showed 8gb of ram (I have 16 installed). I took out and re-slotted the ram, still the bug. I took out the ram, my CPU and reinstalled them. This apperently fixed the error for some reason.
I have also heard speculations about creating a new profile would fix it but havent tried.
I have also been getting a lot of crashed caused by memory faliures and so on.
An example in zeus: you have 2 cars grouped together in one squad. Then you place another squad in the vic that is not SL. If you now group the AI in the back of the car to the squad in front, there is a chanse of a crash. I will try to reproduce this.
Hope this helped